Question

How many molecules are in 2.5 mol of NaCl?

Answer 1

The number of molecules that can be found in a given mole is given as the Avogadro's constant:

1 mole of substance = 6.02 x 10²³ molecules

2.5 mole of NaCl = 2.5 x 6.02 x 10²³ molecules

= 1.51 x 10²⁴ molecules